Sleep bag



FIG. 1 is an exemplary perspective view illustrating a baby within a sleep bag as illustrated herein;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof.

The broken lines shown illustrating the baby, and portions of the sleep bag, that form no part of the claimed design. 

CLAIM The ornamental design for a sleep bag, as shown and described. 